Apparatus for compressing air.



H. H. FREY.

APPARATUS FOR COMPBESSING AIR.

APPLIOATION FILED DBO. 2a. 1912.

151085984.. Patented Sept. 1, 1914.

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Herinner H. rREY, or cercado, immers.

.errane'rus non" coivrrnnssrnc ein;

License;

i v Specification of Letters atent.

Patented Slept. 1,319`

Application'iled December 23, 1812. Serial Ne. 738,168. y

To all 'whom 'it may concer/rt y Be it known that I, HERBERT H. FREY, acitizen of the United States, residing at Chicago, in the county of Cookand State of plllinois, have invented a certain new and usefulImprovement in Apparatus f or C om# pressing Air, of which the followingis a full, clear, concise, and exact description, reference being had tothe accompanying En' drawing, forming a part of' this specification.

Myinvention relates to apparatus for. compressing 'air and the object ofmy inven tion is to provide a device for thatl purr pose which itself isoperated by air compres- \sion so that it may be applied to an otherwiseidle cylinder ol2 an internal combustion engine and be operated by theair compressed 'by the piston in said cylinder.

git; The device of my invention is particularly adapted for use in theautomobile industry, sinceit may be employed for. pumping up tires andmay be operated automatically bymerelysubstitutingitjor one o'the spark13a plugs of the engine' of an automobile.

My present invention .y is particularly concerned witlrfthe provision ofcertain irnprovements oyer the formof apparatus for compressing airshown and described in my Patent '.'No.'1,001,132 grantedA August 22d,1911; My aforesaid patentdiscloses apparatus for compressing aircomprising a socalled f breather valve. ln my present applicati'on Idescribe and claim an improved breather valve,7 which is illustrated incombination with compounding mechanism whereby extremely high pressuresmay be obtained in comparatively short periods of time.

el! Structurally my invention comprises a compression cylinder and apower cylinder, the former being of smaller diameter than the latter;each of said cylinders' having a piston member reciprocating therein.These piston members are mechanically connected and the piston in thepower cylinder is subject to the compression formed in the enginecylinder with which it is associated. Under the influence of thecompression formed in the engine cylinder, the piston in the powercylinder, which I shall call the power piston, is moved intermittentlyin one direction while the return movement is secured by the suctionproduced by the piston in the 55 engine cylinder, the air cushion whichis formed in the top ofthe power cvlinder' and whatever effectV gravitymay have.

The power piston and the pistonfwhicli operates in the compressioncylinder, which I shall call the compressionpiston, mayif desired, becast to forni one inte'vral" unit. f lLeading from below the powerfistontoa.' pointIA above the lcompression p' sten', is valved passage.This valvedf"pti,ssii" e has* communication with a stern'cerriedl'ythelower end` of thev casing ofthefpower'eylilp der, through which stemthe powerylinder has communication with the engine cylinder, Due to thepresenceof the valvdpa'ssage just mentioned, previously compressed iairat a pressure higher than jtmospliericpres-A sure, is passed from theengine cylinder into 4the compression cylinder'before theupiverdImovement of the connected pistons` is 'coml menced. l Y l n 'itLocated. in the stem which connects the: power .cylinder with theenginecylindexg .a valve whichl l call the breathervalve 15 My presentinvention is-'lperticulnrl'y'eoi cerned with certain improvementsfin7 Seso-called breather valve. This 1? breather 'l 'valve comprises e valveseat located 'fin the i side of the stem, a valve memberrlforisai'dseat, and e spring-for normally'retaining said valve member impositionupenjits'seat, said spring extending acrosi; the openin Aiin said stemand bearing against tlie'walof said stem at a point diametricallylopposite said valve member. i

My invention also has to dowith certain valved passages whereby air atatmospheric" pressure is a mitted to the compression 'cyliinder andwhereby compressed air fis-passed Afrom the compression cylinder into ahose and thence to a tire which is to beiinfla'tedgor other containerfor compressed 'ain 'Cerf` tain cushioning devices vare provided to resivent pounding of the pistons within t eii: respective cylinders.

These and other features of the device of my invention are disclosed indetail in the"- following description and are illustrated in theaccompanying drawing in which the-dey vice of my invention and theengine cylinder associated therewith are shown in longitudi- 'it nalsection. c

The power cylinder is illustrated at 1, and it will be seen that thispower cylinder has a central boss 2, extending downwardly let .therefrom, said bossbeing provided with'a 1T reduced portion 3,externally threaded in order that said reduced portion may be screwthreaded into the spark plug opening of a gas engine cylinderillustrated at 4. The piston for the cylinder 4, is illustrated at Castintegrally with the power cylinder 1, is 'the compression cylinder 6,which is of smaller diameter than the power cylinder and is disposedconcentric therewith. The compression cylinder is provided with suitablecooling flanges `7, as shown. Located a short distance below the annularshoulder S, are a plurality of apertures 9, the purpose of which will behereinafter described.. Located in the top of the compression cylinder6, is a ball check valve 10, seating against atmospheric pressure, and aball check valve 11, seating against s pressure within the vcompressioncylinder 6. The air taken oft through the check valve 11, passes througha suitable nipple 12, to which is secured a hose 13, as shown.

Disposed within the power and compression. cylinders are the power andcompression pistons, illustratedat 14 and 15, respectively. Thesepistons constitute an integral unit, as sho'wn. Each of the pistons isprovided with suitable packing rings 16, as illustrated. Extending froma point below the power piston to a point above the com pression piston,is a central passageway 17, which is enlarged at 18, and 19, as shown.Located in the enlarged portion 18, of the passageway 17, is a ballcheck valve 20, seating against pressure coming from the power cylinder.This check valve comprises a ball normally held upon its seat by aspring, bearing against and disposed around a reduced portion of a plug21, threaded into the passage 17, as shown. This plug is provided with aplurality of apertures indicated at 22.

Threaded into the central bore of the boss 2, is a projection 23, which,when the pistons are in the position shown in the drawing, is locatedwithin the enlarged portion 19, of the passageway 17, as shown. Thisprojection 23, is provided for the purpose of cushioning the powerpiston on itsdown stroke. In practice there is necessarily'a slightclearance between this projection 23 and the piston 14, in order thatair may leak around the projection and get under the power piston 14.

The central hess 2, is provided with a transverse bore intersecting thecentral passage therethrough. Located in this transverse bore is atapered stop cock 2l, provided with a handlel 2.7, as shown. This stopf-oek is provided with a trz'insrersc passageway Q6, which when the.slop cock is in the posin tion shown in the drawings is in etl'eft apart of the' central bore through the [was 2, which boss constitutes thestein for the davife in question. he central llore through the boss isillustrated at 27. Threaded into the stop cock 24, as shown, is a valveseat 2S, provided with a flange 29, adapted to engage the boss 2.Bearing against the seat is a ball 30, which is normally held inpesition by means of aspring 301, extending directly across the centralbore through the stem and bearing?,` ina suitable socket 31, asillustrated.

The operation of the device of my inven 'tion is as follows: 0n thcupstroke of the piston 5 within the engine cylinder 4, air is compressedabove the piston and is forced through the stem, projection 2?, andvalved passage 17, into the compression cylinder. When the pressurewithin the compression cylinder is equal to or substantially equal tothe pressure within the cylinder 4, the valve 20, is seated. The pistonsare then moved upward due to the increasing pressure within the cylinder4, air leaking around the projection toa point below the piston 14. Dueto the difference in the diameter of the power and compression pistons,the air within the compression cylinder is raised to a high pressure,and is taken off throughi check valve 11 and hose 13. When the po'werpiston 14 has passed the holes 9 in the wall of the power cylinder, airis trapped in the annular space above these holes, this air serving as acushion to revent the power cylinder pounding against the annularshoulder 8. Upon the ldown stroke of the piston 5, the pistons 14 and15, are drawn downwardly, due to the partial vacuum produced Aby thepiston 5. At the same time air at atmospheric pressure is supplied tothe engine cylinder through the breather valve. Upon the down stroke ofthe pistons, air passing in through the intake valve 10, prevents theproduction of a vacuum in the compression cylinder. When, upon the downstrokenthe projection 23 enters the enlarged portion 19, of thepassageway 17, 'a quantity of air is trapped below the power piston andserves as a cushion to prevent the power piston pounding against thebottom of the power cylinder. The next upward stroke of the pistonwiihinthe engine cylinder again raises the power and compression pistonswithin their respective cylinders. Due to inertia and friction, thepistons 14 and 15 do not start upon their upward travel until a certainpressure is developed within the compression cylinder. The operationabove-descrilml may be continued as long as the operation of the piston5 within the engine cylinder 4, is continued.

lV hat I claim and desire to secure by Letters Patent of the UnitedStates is:

1. In a. device of the class described, a pair of differentialcylinders, connected pistous in said cylinders, the lower end of thelarger cylinder being provided with a stem having :L breathe? v "Y n.matween .nm

d passage. and the said bi' ,niihac ml va? comprwlgg :1 a @ne 51d@ miSunil paging@ n, 'v mamma;

a nd n, CoxmfzbsSs f homing lve member against Gang ocme Wlthm vise ik@dass escrmd, a a, psgcn in said cylinder, ,Q 5f ich@ iowa? end @T saccyhmagh said sten, and a 'iii @Teather Halve comprisbeer :md aspringnorma-ily v ha, number against its seat,

valve mem )er mol spring beng'oc'ad in 'Lila gmssag@ through Suid siem.

.in Wimss wr-faul?, hereunto subscrbe

